'Vote against the president, and your head will be on a pike': GOP Senators 'are warned' not to break ranks with Trump in impeachment vote

Republican senators have been warned in stark terms not to break ranks with President Donald Trump during the impeachment trial, according to a new report.

'Vote against the president, and your head will be on a pike,' the senators were warned, an unnamed source close to the president told CBS News.

It's unclear from the report whether the warning was issued by the White House or Republican leadership in the Senate.

So far, no Republican yet has defied the party on a series of procedural votes that set the rules for the trial — but the true test of loyalty is yet to come on the vote to convict.